Airtight oil taking sleeve device and method of high-voltage current transformer oil drain valve

Abstract

The application discloses a kind of high-voltage current transformer oil drain valve's sealed oil taking sleeve device and method, belong to electric power equipment sampling technical field, the device includes: sleeve assembly, sealing assembly and sampling control assembly;The sleeve assembly is used to be detachably connected with oil drain valve oil nozzle, and in installation or dismounting process, oil drain valve spool is rotated synchronously;The sealing assembly is arranged between sleeve assembly and oil drain valve oil nozzle and valve body, for forming seal before oil drain valve is opened and in oil taking process, prevent oil leakage;The sampling control assembly is used to control the on-off of oil taking passage, and the discharged oil is controlled, when power supply is abnormal or control fails, corresponding oil taking passage can be automatically closed.The application can reduce oil leakage and contact with external air during oil taking process, and improve the safety and convenience of automatic sampling.

Description

Technical Field

[0001] This invention relates to the field of power equipment sampling technology, specifically to a sealed oil sampling sleeve device and method for a high-voltage current transformer oil drain valve. Background Technology

[0002] High-voltage current transformers (CTs) are important oil-filled devices used for measurement and protection in substations. They are filled with insulating oil (transformer oil). To monitor the internal insulation condition of high-voltage current transformers, oil samples need to be periodically taken out from the drain valve at the bottom of the transformer. Oil chromatographic analysis, micro-water testing, withstand voltage testing, and other oil-related tests are then used to determine whether there are latent faults such as partial discharge or overheating inside the equipment.

[0003] During the sampling of insulating oil, it is necessary not only to obtain an oil sample of a specified volume, but also to minimize the contact between the sampled oil and the outside air, as well as oil leakage during the sampling process. On the one hand, existing oil residue in the sampling path may affect the representativeness of the final oil sample; on the other hand, if the oil comes into excessive contact with air during the sampling process, it may also adversely affect the test results.

[0004] In recent years, substations have gradually adopted robotic arms (robots) to replace manual labor in live oil sampling operations, in order to reduce the safety risks of personnel climbing to approach energized equipment. Some existing oil sampling devices have a rotatable sleeve mechanism installed at the end of the robotic arm. The sleeve is driven by a motor to rotate, thereby actuating the valve core to open the valve, and an oil sampling channel is opened in the center of the sleeve, with an oil sampling hose connected to the rear end of the channel.

[0005] However, the oil extraction process usually involves multiple consecutive actions. If the drain valve has been opened but a reliable seal has not yet been formed between the oil extraction device and the drain valve, a small amount of oil that seeps out at the beginning of the valve core opening may leak out from the connection point. If the valve core is opened by an independent drive mechanism after the oil extraction device is fully installed and fixed, additional drive components and transmission structures are required, which not only increases the size and weight of the end mechanism of the robotic arm, but also complicates the oil extraction operation steps.

[0006] The drain valve nozzle and oil sampling device typically have a certain internal volume. Before formal sampling, there may be residual oil from the previous sampling or oil that cannot be directly used as the initial discharge for formal testing. If this oil directly enters the formal sampling container, it may affect the representativeness of the oil sample. Current oil sampling processes usually require manual judgment or additional operations to complete the initial oil discharge and formal oil sample collection, making it difficult to achieve unified and accurate automatic control of waste oil discharge and formal sampling volume.

[0007] For automatic oil extraction devices that use electric shut-off valves to control the oil extraction path, there is still a risk of continuous oil discharge if the shut-off valve cannot automatically return to the closed state when the robotic arm experiences power supply abnormalities, communication failures, or control system malfunctions. Some existing oil extraction devices require structural modifications to the original drain valves or nozzles, or the long-term installation of dedicated interfaces. For the large number of high-voltage current transformers already in operation, such modifications are inconvenient and also hinder the reuse of the robotic arm across different devices. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a sealed oil sampling sleeve device and method for a high-voltage current transformer oil drain valve.

[0009] The present invention adopts the following technical solution.

[0010] The first aspect of the present invention discloses a sealed oil sampling sleeve device for a high-voltage current transformer oil drain valve, comprising: a sleeve assembly, a sealing assembly, and a sampling control assembly. One end of the sleeve assembly is connected to the drain valve of the high-voltage current transformer, which is used to drive the drain valve core to rotate synchronously during installation or disassembly to realize the opening and closing of the drain valve. The other end is connected to the sampling control component, which is used to control the opening and closing of the oil sampling passage and to meter the discharged oil. The sealing component is set between the sleeve assembly and the drain valve nozzle, and between the sleeve assembly and the valve body, to form a seal before the drain valve is opened and during the oil sampling process to prevent oil leakage.

[0011] Preferably, the sleeve assembly includes a sleeve body and a transmission mating cavity. The transmission mating cavity is located inside the sleeve body and corresponds to the position of the valve core head of the drain valve. When the sleeve body is screwed onto the drain valve nozzle in the installation direction, the valve core head enters the transmission mating cavity.

[0012] Preferably, the sleeve body is a cylindrical structure with a hollow inner cavity. One end of the sleeve body is a connecting end, which is connected to the oil drain valve nozzle, and the other end is an oil outlet end. The transmission mating cavity and the valve core head form a circumferential limiting fit, so that when the sleeve body is screwed onto the oil nozzle in the installation direction, the transmission mating cavity drives the valve core to rotate in the opening direction. When the sleeve body rotates to the preset installation position, the valve core reaches the corresponding preset opening state. The preset opening state is: the valve core is opened to the point that the oil outlet channel of the drain valve is connected to the hollow inner cavity of the sleeve body. The preset installation position is: the sleeve body is screwed along the installation direction to the installation position where the valve core reaches the preset opening state.

[0013] Preferably, the sealing assembly includes a front sealing element and a rear sealing element. The rear sealing element is disposed on the side of the sleeve body near the drain valve body and corresponds to the end face of the drain valve body. The front sealing element is disposed between the inner wall of the sleeve body and the outer periphery of the nozzle. The front sealing element and the rear sealing element form a double sealing structure arranged at intervals along the axial direction of the nozzle to block the leakage path between the sleeve body and the nozzle and valve body.

[0014] Preferably, during the process of screwing the sleeve body into the drain valve, the rear end seal contacts the drain valve body to form a seal before the drain valve's outlet channel connects with the inner cavity of the sleeve body. As the sleeve body continues to screw in, the rear end seal is pressed, and the front end seal is pressed to form a seal when the outlet channel connects with the inner cavity of the sleeve body.

[0015] Preferably, the sampling control component includes a metering unit, an electromagnetic drive unit, a waste oil sampling port, and an oil sample sampling port; the metering unit is connected to the oil outlet end of the sleeve body, and the oil is divided into two paths after being metered by the metering unit, which are respectively connected to the waste oil sampling port and the oil sample sampling port; the two sets of electromagnetic drive units are respectively set at the on / off points of the two oil sampling ports.

[0016] Preferably, the metering unit is equipped with a counting module. Each time an oil extraction operation is completed, the counting module records the number of oil extractions. When the cumulative number of oil extractions reaches a preset usage threshold, the metering unit outputs a replacement prompt or alarm signal to prompt the sealing components to be inspected or replaced.

[0017] Preferably, the waste oil sampling port is used to discharge the initial waste oil retained in the nozzle and sleeve cavity, and the oil sample sampling port is used to output the oil sample required for formal testing. The ends of both sampling ports are provided with docking structures for sealing connection with the docking container, forming a closed sampling passage with the docking container to reduce the contact between the oil and the outside air.

[0018] Preferably, the electromagnetic drive unit includes an electromagnetic push rod and a spring. When the electromagnetic push rod is energized, it retracts under the action of magnetic force, releasing the blockage of the oil inlet and opening the corresponding oil circuit. When the power is cut off, the magnetic force disappears, the spring pushes the electromagnetic push rod to reset, re-blocking the oil inlet and automatically closing the corresponding oil circuit. The electromagnetic drive unit enables both oil inlets of the sleeve device to automatically reset to the closed state when the power supply is abnormal, communication is interrupted, or the control system fails, avoiding the risk of insulating oil leakage.

[0019] The second aspect of the present invention discloses a sampling method based on a sealed oil sampling sleeve device for a high-voltage current transformer oil drain valve as described in the first aspect, comprising the following steps: Step 1: Remove the original dust cap from the drain valve nozzle of the high-voltage current transformer. Step 2: Align one end of the sleeve assembly with the drain valve nozzle and rotate to install it. A seal is formed between the sleeve assembly, the drain valve nozzle, and the valve body through the sealing assembly. Step 3: Continue to rotate the sleeve assembly along the installation direction. The sleeve assembly drives the valve core to rotate synchronously to open the oil drain valve. When the sleeve assembly reaches the preset installation position, the valve core reaches the corresponding preset opening state. Step 4: Control the opening and closing of the oil sampling passage through the sampling control component, and measure the oil to complete the discharge of residual waste oil in the inner cavity of the nozzle and sleeve assembly and the collection of oil samples for testing. Step 5: Rotate the sleeve assembly in the opposite direction to drive the valve core to rotate synchronously to close the drain valve, drain the residual oil in the sleeve assembly, remove the sleeve device, reinstall the original dust cap, and complete the sampling.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. During the installation of the sleeve assembly, the present invention can simultaneously drive the valve core to open. The sealing component can form a seal with the drain valve before the sleeve assembly is fully screwed into place. Even if a small amount of oil seeps out in the initial stage of valve core opening, it will be confined in the sealed space inside the sleeve assembly, reducing the possibility of oil leakage and contact with the outside air.

[0021] 2. During the screw-on installation process of the sleeve assembly of the present invention, the valve core is directly driven to rotate synchronously through the transmission mating cavity, so that the installation and fixing of the sleeve assembly and the opening of the oil drain valve can be completed through the same rotation action. There is no need to set up a separate valve opening motor, wrench or complex transmission mechanism, which helps to simplify the structure of the oil extraction device, reduce the load at the end of the robotic arm, and improve the convenience of automatic oil extraction operation.

[0022] 3. This invention sets up a waste oil sampling port and an oil sample sampling port, and controls their opening and closing respectively. During sampling, the waste oil sampling port is opened first to discharge the initial oil in the nozzle and sleeve. After the set pre-discharge volume is reached, the waste oil sampling port is closed, and then the oil sample sampling port is opened for formal sampling. At the same time, the amount of discharged oil is detected in real time by the metering unit, thereby reducing the possibility of residual oil mixing into the formal oil sample and realizing precise control of waste oil discharge volume and formal sampling volume.

[0023] 4. The waste oil inlet and oil sample inlet of the present invention adopt a power failure-shutdown type electromagnetic control component, which can automatically close the corresponding oil inlet path when the power supply is abnormal or the control fails, reducing the risk of continuous discharge of insulating oil. At the same time, the counting module in the metering unit can accumulate and record the number of oil inlets and prompt the inspection or replacement of the seals when the preset usage threshold is reached, thereby improving the safety and maintenance controllability of the device during long-term use. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic cross-sectional view of the overall structure of the sealed oil sampling sleeve device of the present invention; Figure 2 Schematic diagram of the waste oil discharge status of the electromagnetic control component; Figure 3 A schematic diagram showing the oil sample discharge status of the electromagnetic control component; In the figure: 1. Sleeve body; 2. Transmission mating cavity; 3. Front end seal; 4. Rear end seal; 5. Metering unit; 6. Waste oil sampling port; 7. Oil sample sampling port; 8. Electromagnetic push rod; 9. Spring; 10. Valve body; 11. Valve core. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0027] like Figures 1-3 As shown, Embodiment 1 of the present invention discloses a sealed oil sampling sleeve device for a high-voltage current transformer oil drain valve. The device includes: a sleeve assembly, a sealing assembly, and a sampling control assembly. The sleeve assembly is located at the connection end of the device and is detachably connected to the oil drain valve nozzle of the high-voltage current transformer. During installation or disassembly, it drives the valve core 11 of the oil drain valve to rotate synchronously. The sealing assembly is located between the sleeve assembly, the oil drain valve nozzle, and the valve body 10. It is used to form a seal before the oil drain valve is opened and during the oil extraction process to prevent oil leakage during the oil extraction process. The sampling control assembly is connected to the oil outlet end of the sleeve assembly and is used to control the opening and closing of the oil extraction passage and to measure the discharged oil.

[0028] The sleeve assembly includes a sleeve body 1 and a transmission mating cavity 2. The transmission mating cavity 2 is located inside the sleeve body 1 and corresponds to the position of the head of the drain valve core 11. When the sleeve body 1 is screwed onto the oil nozzle in the installation direction, the head of the valve core 11 gradually enters the transmission mating cavity 2.

[0029] The sleeve body 1 is a cylindrical structure with a hollow inner cavity. One end of the sleeve body 1 is a connecting end, which is connected to the oil drain valve nozzle, and the other end is an oil outlet end. An adapter can be provided between the sleeve body 1 and the oil nozzle to adapt the sleeve device to oil drain valve nozzles of different specifications. In this embodiment, the connecting end of the sleeve body 1 is provided with a connecting thread. The specification of the connecting thread is compatible with the connecting thread of the original dust cap of the oil drain valve. Thus, when taking oil, the original dust cap can be directly removed and the sleeve body 1 can be installed without changing the structure of the original oil drain valve and oil nozzle.

[0030] The transmission engagement cavity 2 is located within the connecting end of the sleeve body 1. Its cross-section is non-circular, and its shape matches the cross-sectional shape of the valve core 11 head, thus forming a circumferential limiting fit between the transmission engagement cavity 2 and the valve core 11 head. The transmission engagement cavity 2 can be hexagonal, plum blossom-shaped, square, straight, or other non-circular structures that prevent relative circumferential rotation between the transmission engagement cavity 2 and the valve core 11 head. In a preferred but non-limiting embodiment of the present invention, the transmission engagement cavity 2 has a racetrack-shaped cross-section, and the valve core 11 head correspondingly has a racetrack-shaped cross-section.

[0031] When the sleeve body 1 rotates along the installation direction, the sleeve body 1 is gradually screwed onto the oil drain valve nozzle through the connecting thread on the one hand, and drives the valve core 11 to rotate synchronously in the opening direction through the transmission mating cavity 2 on the other hand.

[0032] It is worth noting that the installation action of the sleeve body 1 and the opening action of the drain valve are achieved by the same rotation action. It is not necessary to use a wrench, motor or other transmission mechanism to operate the valve core 11 separately after the sleeve body 1 is installed. When the sleeve body 1 rotates to the preset installation position, the valve core 11 reaches the corresponding preset opening state. The drain valve can be kept in the oil-taking state without continuing to rotate the sleeve body 1, thereby avoiding excessive tightening, loosening or damage to the sealing structure caused by continuing to rotate the sleeve body 1 after it is installed.

[0033] The preset opening state is: the valve core 11 is opened to the state that the oil outlet channel of the oil drain valve is connected to the hollow inner cavity of the sleeve body 1. The preset installation position is: the sleeve body 1 is screwed along the installation direction to the installation position corresponding to the valve core 11 reaching the preset opening state.

[0034] The sealing assembly includes a front sealing element 3 and a rear sealing element 4. The rear sealing element 4 is disposed on the side of the sleeve body 1 near the drain valve body 10 and corresponds to the end face of the drain valve body 10. The front sealing element 3 is disposed between the inner wall of the sleeve body 1 and the outer periphery of the nozzle. The two sealing elements at both ends form a double sealing structure arranged at intervals along the axial direction of the nozzle to block any leakage paths that may form between the sleeve body 1 and the nozzle and valve body 10.

[0035] The two end seals can each adopt two or more sealing structures to form multiple seals. The seals can be O-rings, lip rings, combined gaskets, or other elastic seals suitable for insulating oil sealing.

[0036] During the process of screwing the sleeve body 1 into the drain valve, the rear sealing element 4 first contacts the drain valve body 10 before the sleeve body 1 is fully in the preset installation position. At this time, an initial seal is formed between the sleeve body 1 and the drain valve. As the sleeve body 1 continues to screw in, the pressure of the rear sealing element 4 further increases. The front sealing element 3 is pressed to form a seal after the sleeve body 1 reaches the preset installation position.

[0037] It is worth noting that the sealing assembly allows the sleeve body 1 to gradually establish a seal during the screwing process without fully screwing it to the end position. Even if a small amount of oil seeps out from the drain valve into the transmission cavity 2 or the inner cavity of the sleeve body 1 during the rotation and opening of the valve core 11, this portion of oil will be confined within the sealed space formed by the sleeve body 1 and the sealing assembly, and will not leak directly into the external environment. It can also be discharged along with the waste oil during the subsequent waste oil pre-discharge process.

[0038] Accordingly, when the sleeve body 1 is in the preset installation position and the valve core 11 is in the preset open state, the sleeve body 1 is rotated in the opposite direction along the disassembly direction, and the transmission mating cavity 2 drives the valve core 11 to rotate synchronously in the closing direction. The rotation angle of the sleeve body 1 corresponding to the valve core 11 rotating from the preset open state to the fully closed state is less than the rotation angle corresponding to the sleeve body 1 rotating out in the opposite direction from the preset installation position to the sealing assembly releasing the seal, so that the sleeve body 1, while still maintaining a seal with the drain valve, first drives the valve core 11 to close the drain valve, and after the drain valve is closed, it continues to rotate out in the opposite direction to release the seal.

[0039] The sampling control component includes a metering unit 5, an electromagnetic drive unit, a waste oil sampling port 6, and an oil sample sampling port 7. The metering unit 5 is connected to the oil outlet end of the sleeve body 1. After the oil is metered by the metering unit 5, it is divided into two paths, which are respectively connected to the waste oil sampling port 6 and the oil sample sampling port 7. The two sets of electromagnetic drive units are respectively set at the on / off points of the two sampling ports.

[0040] In this embodiment, the metering unit 5 is a flow meter. Based on the cumulative flow of the flow meter, the pre-discharge volume of waste oil and the formal oil sample collection volume can be determined respectively.

[0041] The flow meter is also equipped with a counting module. Each time an oil sampling operation is completed, the counting module accumulates the number of oil samplings. When the accumulated number of oil samplings reaches the preset threshold for the number of times the sealing component can be used, the metering unit 5 outputs a replacement prompt or alarm signal to prompt the sealing component to be inspected or replaced. The preset threshold for the number of times the sealing component can be determined according to the structure, material and service life of the sealing component.

[0042] The waste oil inlet 6 is used to discharge the initial waste oil retained in the nozzle and sleeve cavity, and the oil sample inlet 7 is used to output the oil sample required for formal testing. Both inlets are equipped with a sealed docking structure at their ends, which can be formed by using threaded end face sealing rings, pagoda connectors to connect the oil sampling hose, or hollow puncture needles with elastic sealing sampling bottles, etc., to reduce the contact between the oil and the outside air.

[0043] In a preferred but non-limiting embodiment of the present invention, the waste oil sampling port 6 is located at the upper end, the oil sample sampling port 7 is located at the lower end, the interface structure is a threaded interface, the sampling port is provided with an external thread, the sampling bottle mouth is provided with an internal thread that matches it, and after the two are tightened, an end seal is formed by an O-ring seal provided between the end faces.

[0044] The electromagnetic drive unit includes an electromagnetic push rod 8 and a spring 9. When energized, the electromagnetic push rod 8 retracts under magnetic force, releasing the blockage of the oil inlet and opening the corresponding oil circuit. When de-energized, the magnetic force disappears, and the spring 9 pushes the electromagnetic push rod 8 back to its original position, re-blocking the oil inlet and automatically closing the corresponding oil circuit. The electromagnetic drive unit adopts a safety position design that shuts off when power is lost and opens when power is gained. This ensures that in the event of abnormal power supply, communication interruption, or control system failure, both oil inlets can automatically reset to the closed state, fundamentally preventing the risk of continuous leakage of insulating oil.

[0045] During the oil sampling operation, the electromagnetic drive unit at the oil sample inlet 7 is first de-energized and shut down, while the electromagnetic drive unit at the waste oil inlet 6 is energized and turned on. The residual waste oil in the nozzle and sleeve cavity is discharged through the waste oil inlet 6. When the flow meter detects that the cumulative discharge volume has reached the preset waste oil volume, the waste oil inlet 6 is de-energized and shut down. Then, the oil sample inlet 7 is energized and turned on, and the insulating oil flows into the formal sampling container through the oil sample inlet 7. When the cumulative discharge volume reaches the sum of the pre-discharged waste oil volume and the formal sampling volume, the oil sample inlet 7 is de-energized and shut down, and the sampling is completed.

[0046] Embodiment 2 of the present invention discloses a sampling method based on the sealed oil sampling sleeve device for the oil drain valve of a high-voltage current transformer described in Embodiment 1, comprising the following steps: Step 1: Remove the original dust cap from the drain valve nozzle.

[0047] Step 2: Rotate the sleeve assembly onto the drain valve nozzle and establish a seal using the sealing assembly; Specifically, align the connecting end of the sleeve body 1 with the oil drain valve nozzle, and rotate the sleeve body 1 in the installation direction so that the sleeve body 1 is gradually screwed onto the oil drain valve nozzle through the connecting thread. During the screwing process, the rear sealing element 4 first contacts the oil drain valve body 10, and is gradually pressed as the sleeve body 1 continues to be screwed in. Thus, a seal is formed before the sleeve body 1 is fully installed. At the same time, the head of the oil drain valve core 11 gradually enters the transmission mating cavity 2 and forms a circumferential limiting fit with the transmission mating cavity 2.

[0048] Step 3: Continue rotating the sleeve assembly to complete the seal, then open the drain valve; Specifically, continue to rotate the sleeve body 1 along the installation direction, and drive the valve core 11 to rotate synchronously in the direction of opening the drain valve through the transmission mating cavity 2. When the sleeve body 1 reaches the preset installation position, the valve core 11 reaches the corresponding preset opening state, and stop rotating the sleeve body 1. At this time, the installation and fixing of the sleeve body 1 and the opening of the drain valve are completed.

[0049] Step 4: After the residual waste oil in the nozzle and sleeve device is discharged through the sampling control component, an oil sample is collected for testing. In a preferred but non-limiting embodiment of the present invention, step 4 specifically comprises: Step 4.1, set the pre-discharge waste oil volume V 1 and formal sampling quantity V The formal sampling volume is set according to the DGA testing requirements, usually 50mL or 100mL, of which the volume of pre-discharged waste oil is... V 1. Calculated using formula (1): (1) in: V 0 represents the sum of the volumes of the nozzle cavity and the sleeve assembly cavity, in mL; k The substitution coefficient is taken as 1.5-2; When oil sampling begins, the electromagnetic drive unit at the oil sampling port 7 is kept off, while the electromagnetic drive unit at the waste oil sampling port 6 is energized. Upon energization, the electromagnetic push rod 8 overcomes the force of the spring 9 and moves away from the waste oil sampling port 6, opening it. Oil flows through the waste oil sampling port 6 to the waste oil collection container, and the flow meter simultaneously accumulates and detects the discharged oil volume. When the accumulated discharge reaches the pre-discharged waste oil volume V1, the pre-discharge stage is complete. The electromagnetic drive unit at the waste oil sampling port 6 is then de-energized, and the spring 9 drives the electromagnetic push rod 8 to re-seal the waste oil sampling port 6. This process can pre-discharge the oil that was previously retained in the nozzle and the oil that entered the sleeve cavity at the beginning of sampling, and it can also replace the oil in the sampling path. Step 4.2: After the waste oil inlet 6 is closed, the electromagnetic drive unit corresponding to the oil sample inlet 7 is energized, the electromagnetic push rod 8 leaves the oil sample inlet 7, the oil sample inlet 7 is turned on, and the insulating oil enters the sampling container that is sealed to it through the oil sample inlet 7. The flow meter continuously accumulates and detects the amount of oil discharged. When the cumulative discharge reaches V 1 +V When the time is reached, it indicates that the formal sampling volume has reached the set value. At this time, the electromagnetic drive unit corresponding to the oil sample outlet 7 is de-energized, the spring 9 drives the electromagnetic push rod 8 to block the oil sample outlet 7, and the oil discharge stops. The waste oil outlet 6 and the oil sample outlet 7 are both restored to the de-energized and closed state. The counting module in the flow meter records this complete oil sampling process as one oil sampling operation and updates the cumulative number of oil samplings.

[0050] Step 5: After closing the drain valve, drain the residual oil and remove the sleeve device; Specifically, after sampling is completed, the oil sample inlet 7 is kept closed, and the electromagnetic drive unit corresponding to the waste oil inlet 6 is energized and turned on. Then the sleeve body 1 is rotated in the opposite direction. While the sleeve body 1 and the drain valve nozzle are still connected and sealed, the transmission mating cavity 2 drives the drain valve core 11 to rotate synchronously in the closing direction until the valve core 11 is completely closed. After the drain valve core 11 is completely closed, the waste oil inlet 6 is kept open, and the residual oil in the inner cavity of the sleeve body 1 is discharged into the waste oil collection container through the waste oil inlet 6. After the residual oil is discharged, the electromagnetic drive unit corresponding to the waste oil inlet 6 is de-energized and shut down. Then, the sleeve body 1 is rotated out in the opposite direction to release the seal of the rear sealing element 4, and the sleeve device is separated from the oil nozzle. Finally, the original dust cap is reinstalled.

[0051] Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. During the installation of the sleeve assembly, the present invention can simultaneously drive the valve core to open. The sealing component can form a seal with the drain valve before the sleeve assembly is fully screwed into place. Even if a small amount of oil seeps out in the initial stage of valve core opening, it will be confined in the sealed space inside the sleeve assembly, reducing the possibility of oil leakage and contact with the outside air.

[0052] 2. During the screw-on installation process of the sleeve assembly of the present invention, the valve core is directly driven to rotate synchronously through the transmission mating cavity, so that the installation and fixing of the sleeve assembly and the opening of the oil drain valve can be completed through the same rotation action. There is no need to set up a separate valve opening motor, wrench or complex transmission mechanism, which helps to simplify the structure of the oil extraction device, reduce the load at the end of the robotic arm, and improve the convenience of automatic oil extraction operation.

[0053] 3. This invention sets up a waste oil sampling port and an oil sample sampling port, and controls their opening and closing respectively. During sampling, the waste oil sampling port is opened first to discharge the initial oil in the nozzle and sleeve. After the set pre-discharge volume is reached, the waste oil sampling port is closed, and then the oil sample sampling port is opened for formal sampling. At the same time, the amount of discharged oil is detected in real time by the metering unit, thereby reducing the possibility of residual oil mixing into the formal oil sample and realizing precise control of waste oil discharge volume and formal sampling volume.

[0054] 4. The waste oil inlet and oil sample inlet of the present invention adopt a power failure-shutdown type electromagnetic control component, which can automatically close the corresponding oil inlet path when the power supply is abnormal or the control fails, reducing the risk of continuous discharge of insulating oil. At the same time, the counting module in the metering unit can accumulate and record the number of oil inlets and prompt the inspection or replacement of the seals when the preset usage threshold is reached, thereby improving the safety and maintenance controllability of the device during long-term use.

[0055] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0056] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0057] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0058] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A sealed oil sampling sleeve device for a high-voltage current transformer oil drain valve, characterized in that: include: Sleeve assembly, sealing assembly, and sampling control assembly; One end of the sleeve assembly is connected to the drain valve of the high-voltage current transformer, which is used to drive the drain valve core (11) to rotate synchronously during installation or disassembly, so as to realize the opening and closing of the drain valve. The other end is connected to the sampling control component, which is used to control the opening and closing of the oil sampling passage and to meter the discharged oil. The sealing component is set between the sleeve assembly and the drain valve nozzle, and between the sleeve assembly and the valve body (10), which is used to form a seal before the drain valve is opened and during the oil sampling process to prevent oil leakage.

2. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 1, characterized in that: The sleeve assembly includes a sleeve body (1) and a transmission mating cavity (2). The transmission mating cavity (2) is located inside the sleeve body (1) and corresponds to the head position of the drain valve core (11). When the sleeve body (1) is screwed onto the drain valve nozzle in the installation direction, the head of the valve core (11) enters the transmission mating cavity (2).

3. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 2, characterized in that: The sleeve body (1) is a cylindrical structure with a hollow inner cavity. One end of the sleeve body (1) is a connecting end, which is connected to the oil drain valve nozzle, and the other end is an oil outlet end. The transmission mating cavity (2) and the head of the valve core (11) form a circumferential limiting fit, so that when the sleeve body (1) is screwed onto the oil nozzle in the installation direction, the valve core (11) is driven to rotate in the opening direction through the transmission mating cavity (2). When the sleeve body (1) rotates to the preset installation position, the valve core (11) reaches the corresponding preset opening state. The preset opening state is: the valve core (11) is opened to the state that the oil outlet channel of the oil drain valve is connected to the hollow inner cavity of the sleeve body (1). The preset installation position is: the sleeve body (1) is screwed along the installation direction to the installation position where the valve core (11) reaches the preset opening state.

4. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 3, characterized in that: The sealing assembly includes a front sealing element (3) and a rear sealing element (4). The rear sealing element (4) is located on the side of the sleeve body (1) near the drain valve body (10) and corresponds to the end face of the drain valve body (10). The front sealing element (3) is located between the inner wall of the sleeve body (1) and the outer periphery of the nozzle. The front sealing element (3) and the rear sealing element (4) form a double sealing structure arranged at intervals along the axial direction of the nozzle to block the leakage path between the sleeve body (1) and the nozzle and valve body (10).

5. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 4, characterized in that: During the process of screwing the sleeve body (1) into the drain valve, the rear end seal (4) contacts the drain valve body (10) to form a seal before the drain valve's oil outlet channel connects with the inner cavity of the sleeve body (1). As the sleeve body (1) continues to screw in, the rear end seal (4) is pressed tight, and the front end seal (3) is pressed tight to form a seal when the oil outlet channel connects with the inner cavity of the sleeve body (1).

6. The sealed oil sampling sleeve device for the oil drain valve of a high-voltage current transformer according to claim 2, characterized in that: The sampling control component includes a metering unit (5), an electromagnetic drive unit, a waste oil sampling port (6), and an oil sample sampling port (7). The metering unit (5) is connected to the oil outlet of the sleeve body (1). After the oil is metered by the metering unit (5), it is divided into two paths, which are connected to the waste oil sampling port (6) and the oil sample sampling port (7) respectively. The two sets of electromagnetic drive units are respectively set at the on / off points of the two sampling ports.

7. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 6, characterized in that: The metering unit (5) is equipped with a counting module. Each time an oil extraction operation is completed, the counting module records the number of oil extractions. When the cumulative number of oil extractions reaches the preset usage threshold, the metering unit (5) outputs a replacement prompt or alarm signal to prompt the sealing components to be inspected or replaced.

8. The sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 6, characterized in that: The waste oil inlet (6) is used to discharge the initial waste oil retained in the nozzle and sleeve cavity, and the oil sample inlet (7) is used to output the oil sample required for formal testing. Both inlets are equipped with docking structures for sealing connection with the docking container, forming a closed sampling passage with the docking container to reduce the contact between the oil and the outside air.

9. A sealed oil tapping sleeve device for a high-voltage current transformer oil drain valve according to claim 6, characterized in that: The electromagnetic drive unit includes an electromagnetic push rod (8) and a spring (9). When the electromagnetic push rod (8) is energized, it retracts under the action of magnetic force, releasing the blockage of the oil outlet and opening the corresponding oil circuit. When the power is cut off, the magnetic force disappears, and the spring (9) pushes the electromagnetic push rod (8) to reset, re-blocking the oil outlet and automatically closing the corresponding oil circuit. The electromagnetic drive unit enables the sleeve device to automatically reset both oil outlets to the closed state when the power supply is abnormal, communication is interrupted, or the control system fails, thus avoiding the risk of leakage of insulating oil.

10. A sampling method, based on a sealed oil sampling sleeve device for a high-voltage current transformer oil drain valve according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Remove the original dust cap from the drain valve nozzle of the high-voltage current transformer. Step 2: Align one end of the sleeve assembly with the drain valve nozzle and rotate to install it. A seal is formed between the sleeve assembly, the drain valve nozzle, and the valve body (10) by the sealing assembly. Step 3, continue to rotate the sleeve assembly along the installation direction, and drive the valve core (11) to rotate synchronously through the sleeve assembly to open the oil drain valve. When the sleeve assembly reaches the preset installation position, the valve core (11) reaches the corresponding preset opening state. Step 4: Control the opening and closing of the oil sampling passage through the sampling control component, and measure the oil to complete the discharge of residual waste oil in the inner cavity of the nozzle and sleeve assembly and the collection of oil samples for testing. Step 5: Rotate the sleeve assembly in the opposite direction to drive the valve core (11) to rotate synchronously to close the drain valve, discharge the residual oil in the sleeve assembly, remove the sleeve device, reinstall the original dust cap, and complete the sampling.

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